Not graded
Sunan ad-Darimi 833
أَخْبَرَنَا الْحَكَمُ بْنُ الْمُبَارَكِ أَخْبَرَنَا مَخْلَدُ بْنُ يَزِيدَ عَنْ مَعْقِلِ بْنِ عُبَيْدِ اللَّهِ عَنْ عَطَاءٍ قَالَ أَدْنَى الْحَيْضِ يَوْمٌ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 833).